Revert "add versions and constraints for packages and samples"

This is currently blocking us from testing samples.

BUG=
R=kasperl@google.com

Review URL: https://codereview.chromium.org//59513007

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart/pkg/stack_trace@29960 260f80e4-7a28-3924-810f-c04153c831b5

pkgs/stack_trace/pubspec.yaml

diff --git a/pkgs/stack_trace/pubspec.yaml b/pkgs/stack_trace/pubspec.yaml
index 33af867..b672df7 100644
--- a/pkgs/stack_trace/pubspec.yaml
+++ b/pkgs/stack_trace/pubspec.yaml
@@ -1,14 +1,11 @@
 name: stack_trace
-version: 0.9.0
 author: "Dart Team <misc@dartlang.org>"
 homepage: http://www.dartlang.org
 description: >
   A package for manipulating stack traces and printing them readably.
 
 dependencies:
-  path: ">=0.9.0 <0.10.0"
+  path: any
 
 dev_dependencies:
-  unittest: ">=0.9.0 <0.10.0"
-environment:
-  sdk: ">=1.0.0 <2.0.0"
+  unittest: any